Journal
DIAMOND AND RELATED MATERIALS
Volume 14, Issue 1, Pages 86-92Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2004.07.012
Keywords
nanocrystalline; diamond film; vibrational properties characterization
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It has long been known that by slightly altering the deposition conditions for diamond in plasma-enhanced chemical vapor deposition (PECVD), a transition from a microcrystalline to a nanocrystalline diamond morphology can be affected. The method of this transition, however, is not clear. This work investigates that transition by using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Raman spectroscopy. These experiments show that far from being a continuous transition, there is competitive growth between microcrystalline and nanocrystalline diamonds. Additionally, this work confirms the interpretation that certain peaks in the Raman spectrum previously attributed to nanocrystalline diamond are indeed due to the presence of hydrogen at the grain boundaries. For ultrananocrystalline diamond (UNCD) films, we verify that none of the spectral features observed using visible Raman spectroscopy can be attributed to sp(3)-bonded carbon, although the sample is composed of similar to95% sp(3)-bonded carbon. Thus, the Raman signal in UNCD can be considered to be solely due to the disordered sp(2)-bonded carbon at the grain boundaries. (C) 2004 Elsevier B.V. All rights reserved.
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